Hello everybody, a question that connect to the question of Frederik Karlsons about 'how to stand. betas' With the stand. betas i can compare the influence of the different explaning variables. What do i with the betas of factors? I can't use the solution of JohnFox, because there is no sd of an factor. How can i compare the influence of the factor with the influence of the numeric variables? Thanks for any help joerg -- Joerg Maeder .:|:||:..:.||.:: maeder at atmos.umnw.ethz.ch Tel: +41 1 633 36 25 .:|:||:..:.||.:: http://www.iac.ethz.ch/staff/maeder PhD student at INSTITUTE FOR ATMOSPHERIC AND CLIMATE SCIENCE (IACETH) ETH Z?RICH Switzerland -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._
Dear Joerg, At 09:40 AM 3/5/2002 +0100, you wrote:>a question that connect to the question of Frederik Karlsons about 'how >to stand. betas' >With the stand. betas i can compare the influence of the different >explaning variables. What do i with the betas of factors? I can't use >the solution of JohnFox, because there is no sd of an factor. How can i >compare the influence of the factor with the influence of the numeric >variables?The simple function in my response to Frederik Karlsons's question will work with a model that includes factors, producing a standardized coefficient for each column of the model matrix (except the constant), but the result is not sensible, depending for example on the contrast coding. I don't believe that there is a sensible answer to your question, and moreover, I would argue that standardized coefficients are not even terribly useful for comparing the "influence" of quantitative predictors. By the way, the function that I included in my previous message inadvertently used the response function in my car library to extract the response variable from the model. Without this library attached, one could substitute model.response(model.frame((mod))). Regards, John ----------------------------------------------------- John Fox Department of Sociology McMaster University Hamilton, Ontario, Canada L8S 4M4 email: jfox at mcmaster.ca phone: 905-525-9140x23604 web: www.socsci.mcmaster.ca/jfox ----------------------------------------------------- -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._
>a question that connect to the question of Frederik Karlsons >about 'how >to stand. betas' >With the stand. betas i can compare the influence of the >different >explaning variables. What do i with the betas of factors? I can't >use >the solution of JohnFox, because there is no sd of an factor. >How can i >compare the influence of the factor with the influence of the >numeric >variables?Use the t-values from summary(lm(....))! Are not the standardized regression coefficients the "t values"? cheers, vito ----- Original Message ----- From: "Joerg Maeder" <maeder at atmos.umnw.ethz.ch> To: "'R-help at lists.R-project.org'" <R-help at stat.math.ethz.ch> Sent: Tuesday, March 05, 2002 9:40 AM Subject: [R] enhanced Question to stand. Beta Hello everybody, a question that connect to the question of Frederik Karlsons about 'how to stand. betas' With the stand. betas i can compare the influence of the different explaning variables. What do i with the betas of factors? I can't use the solution of JohnFox, because there is no sd of an factor. How can i compare the influence of the factor with the influence of the numeric variables? Thanks for any help joerg -- Joerg Maeder .:|:||:..:.||.:: maeder at atmos.umnw.ethz.ch Tel: +41 1 633 36 25 .:|:||:..:.||.:: http://www.iac.ethz.ch/staff/maeder PhD student at INSTITUTE FOR ATMOSPHERIC AND CLIMATE SCIENCE (IACETH) ETH Z?RICH Switzerland -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-. -.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._. _._ -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._
Dear Vito, At 02:49 PM 3/5/2002 +0100, vito muggeo wrote:> >a question that connect to the question of Frederik Karlsons >about 'how > >to stand. betas' > >With the stand. betas i can compare the influence of the >different > >explaning variables. What do i with the betas of factors? I can't >use > >the solution of JohnFox, because there is no sd of an factor. >How can i > >compare the influence of the factor with the influence of the >numeric > >variables? > > >Use the t-values from summary(lm(....))! >Are not the standardized regression coefficients the "t values"?No: The t-values are the ratios of the coefficients to their standard errors. What's usually meant by "standardized coefficients" are the coefficients obtained when the variables (both response and predictors) are standardized to unit variance. John ----------------------------------------------------- John Fox Department of Sociology McMaster University Hamilton, Ontario, Canada L8S 4M4 email: jfox at mcmaster.ca phone: 905-525-9140x23604 web: www.socsci.mcmaster.ca/jfox ----------------------------------------------------- -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._